Bridges and Ports, I guess.
No, seriously, I don't know what they should do tbh. I'm sure people will hate it anyways. Proper beaches in vanille would probably help.
Regarding bridges, some of the vanilla Streets still have no proper bridge variants. That would be my minimum requirement. Footpath bridges and pedestrian street bridges would be great as well.
For ports, I'd like touristy ports mainly. And they should integrate well with the vanilla cargo and passenger ship piers.